fallback: translate: fpext bfloat

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	translate: fpext bfloat
Occurrences:	22 in 6 configs, 2 test files
Snippet from:	bf16-promote.ll @test_fpextend_float via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32d`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind
define float @test_fpextend_float(ptr %p) #0 {
  %a = load bfloat, ptr %p, align 2
  %r = fpext bfloat %a to float
  ret float %r
}

attributes #0 = { nounwind }

Reproduce:

llc -mtriple=riscv32 -mattr=+d -target-abi=ilp32d -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+d -target-abi=ilp32d -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to translate instruction: fpext: '  %r = fpext bfloat %a to float' (in function: test_fpextend_float)
warning: Instruction selection used fallback path for test_fpextend_float

Occurrences (22):

Input	Function	Config
bf16-promote.ll	test_fpextend_float	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32d`
bf16-promote.ll	test_fpextend_double	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32d`
bf16-promote.ll	test_fpextend_float	`-mtriple=riscv64 -mattr=+d -target-abi=lp64d`
bf16-promote.ll	test_fpextend_double	`-mtriple=riscv64 -mattr=+d -target-abi=lp64d`
xandesbfhcvt.ll	loadstorebf16	`-mtriple=riscv32 -mattr=+xandesbfhcvt -target-abi ilp32f -verify-machineinstrs`
xandesbfhcvt.ll	loadstorebf16	`-mtriple=riscv32 -mattr=+zfh,+xandesbfhcvt -target-abi ilp32f -verify-machineinstrs`
xandesbfhcvt.ll	loadstorebf16	`-mtriple=riscv64 -mattr=+xandesbfhcvt -target-abi lp64f -verify-machineinstrs`
xandesbfhcvt.ll	loadstorebf16	`-mtriple=riscv64 -mattr=+zfh,+xandesbfhcvt -target-abi lp64f -verify-machineinstrs`
bf16-promote.3bd53bac9d.ll (mutant of bf16-promote.ll)	test_fpextend_float	`-mtriple=riscv64 -mattr=+d -target-abi=lp64d`
bf16-promote.3bd53bac9d.ll (mutant of bf16-promote.ll)	test_fpextend_double	`-mtriple=riscv64 -mattr=+d -target-abi=lp64d`
bf16-promote.ba1a605c60.ll (mutant of bf16-promote.ll)	test_fpextend_double	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32d`
bf16-promote.c5e332c49e.ll (mutant of bf16-promote.ll)	test_fpextend_float	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32d`
bf16-promote.c5e332c49e.ll (mutant of bf16-promote.ll)	test_fpextend_double	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32d`
bf16-promote.d0ff33792a.ll (mutant of bf16-promote.ll)	test_fpextend_double	`-mtriple=riscv64 -mattr=+d -target-abi=lp64d`
xandesbfhcvt.306b20264d.ll (mutant of xandesbfhcvt.ll)	loadstorebf16	`-mtriple=riscv64 -mattr=+xandesbfhcvt -target-abi lp64f -verify-machineinstrs`
xandesbfhcvt.4207a06657.ll (mutant of xandesbfhcvt.ll)	loadstorebf16	`-mtriple=riscv64 -mattr=+zfh,+xandesbfhcvt -target-abi lp64f -verify-machineinstrs`
xandesbfhcvt.586b33e8fa.ll (mutant of xandesbfhcvt.ll)	loadstorebf16	`-mtriple=riscv32 -mattr=+zfh,+xandesbfhcvt -target-abi ilp32f -verify-machineinstrs`
xandesbfhcvt.9382953bb2.ll (mutant of xandesbfhcvt.ll)	loadstorebf16	`-mtriple=riscv64 -mattr=+zfh,+xandesbfhcvt -target-abi lp64f -verify-machineinstrs`
xandesbfhcvt.a7a3a425ec.ll (mutant of xandesbfhcvt.ll)	loadstorebf16	`-mtriple=riscv32 -mattr=+xandesbfhcvt -target-abi ilp32f -verify-machineinstrs`
xandesbfhcvt.c796a8d9a8.ll (mutant of xandesbfhcvt.ll)	loadstorebf16	`-mtriple=riscv32 -mattr=+xandesbfhcvt -target-abi ilp32f -verify-machineinstrs`
xandesbfhcvt.eeb4c81e3e.ll (mutant of xandesbfhcvt.ll)	loadstorebf16	`-mtriple=riscv64 -mattr=+xandesbfhcvt -target-abi lp64f -verify-machineinstrs`
xandesbfhcvt.f2318a97d9.ll (mutant of xandesbfhcvt.ll)	loadstorebf16	`-mtriple=riscv32 -mattr=+zfh,+xandesbfhcvt -target-abi ilp32f -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.